Question Hi, I am experiencing an issue, 1832i AP Unable to join 3504 controller. Following are the error I am receiving  .0000] CAPWAP State: DTLS Setup [*02/18/2019 08:19:37.0299] [*02/18/2019 08:19:37.0299] CAPWAP State: Join [*02/18/2019 08:19:37.0299] Sending Join request to 172.16.16.16 through port 5248 [*02/18/2019 08:20:34.0222] [*02/18/2019 08:20:34.0222] CAPWAP State: DTLS Teardown [*02/18/2019 08:20:38.8007] Discovery Response from 172.16.16.16 [*02/18/2019 08:20:48.0000] Discovery Response from 172.16.16.16 [*02/18/2019 08:20:48.0000] Discovery Response from 172.16.16.16 [*02/18/2019 08:20:48.0000] [*02/18/2019 08:20:48.0000] CAPWAP State: DTLS Setup [*02/18/2019 08:20:48.0399] [*02/18/2019 08:20:48.0399] CAPWAP State: Join [*02/18/2019 08:20:48.0399] Sending Join request to 172.16.16.16 through port 5248 [*02/18/2019 08:21:45.0122] [*02/18/2019 08:21:45.0122] CAPWAP State: DTLS Teardown [*02/18/2019 08:21:49.8107] Discovery Response from 172.16.16.16 [*02/18/2019 08:21:59.0000] Discovery Response from 172.16.16.16 [*02/18/2019 08:21:59.0000] Discovery Response from 172.16.16.16 [*02/18/2019 08:21:59.0000] [*02/18/2019 08:21:59.0000] CAPWAP State: DTLS Setup [*02/18/2019 08:21:59.0399] [*02/18/2019 08:21:59.0399] CAPWAP State: Join [*02/18/2019 08:21:59.0399] Sending Join request to 172.16.16.16 through port 5248 [*02/18/2019 08:22:56.0122] [*02/18/2019 08:22:56.0122] CAPWAP State: DTLS Teardown [*02/18/2019 08:23:00.8007] Discovery Response from 172.16.16.16 [*02/18/2019 08:23:10.0000] Discovery Response from 172.16.16.16 [*02/18/2019 08:23:10.0000] Discovery Response from 172.16.16.16 [*02/18/2019 08:23:10.0000] [*02/18/2019 08:23:10.0000] CAPWAP State: DTLS Setup [*02/18/2019 08:23:10.0299] [*02/18/2019 08:23:10.0299] CAPWAP State: Join [*02/18/2019 08:23:10.0399] Sending Join request to 172.16.16.16 through port 5248 [*02/18/2019 08:24:07.0222] [*02/18/2019 08:24:07.0222] CAPWAP State: DTLS Teardown [*02/18/2019 08:24:11.8007] Discovery Response from 172.16.16.16 [*02/18/2019 08:24:22.0000] Discovery Response from 172.16.16.16 [*02/18/2019 08:24:22.0000] Discovery Response from 172.16.16.16   Below are the device and firmware details. System Information Manufacturer's Name.............................. Cisco Systems Inc. Product Name..................................... Cisco Controller Product Version.................................. 8.8.111.0 RTOS Version..................................... 8.8.111.0 Bootloader Version............................... 8.5.103.0 Emergency Image Version.......................... 8.5.103.0 AP2C0B.E9C8.0CF0#sh version              Restricted Rights Legend Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c) of the Commercial Computer Software - Restricted Rights clause at FAR sec. 52.227-19 and subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at DFARS sec. 252.227-7013.             Cisco Systems, Inc.             170 West Tasman Drive             San Jose, California 95134-1706 This product contains cryptographic features and is subject to United States and local country laws governing import, export, transfer and use. Delivery of Cisco cryptographic products does not imply third-party authority to import, export, distribute or use encryption. Importers, exporters, distributors and users are responsible for compliance with U.S. and local country laws. By using this product you agree to comply with applicable laws and regulations. If you are unable to comply with U.S. and local laws, return this product immediately. A summary of U.S. laws governing Cisco cryptographic products may be found at: http://www.cisco.com/wwl/export/crypto/tool/stqrg.html If you require further assistance please contact us by sending email to export@cisco.com. This product contains some software licensed under the "GNU General Public License, version 2" provided with ABSOLUTELY NO WARRANTY under the terms of "GNU General Public License, version 2", available here: http://www.gnu.org/licenses/old-licenses/gpl-2.0.html This product contains some software licensed under the "GNU Library General Public License, version 2" provided with ABSOLUTELY NO WARRANTY under the terms of "GNU Library General Public License, version 2", available here: http://www.gnu.org/licenses/old-licenses/lgpl-2.0.html This product contains some software licensed under the "GNU Lesser General Public License, version 2.1" provided with ABSOLUTELY NO WARRANTY under the terms of "GNU Lesser General Public License, version 2.1", available here: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html This product contains some software licensed under the "GNU General Public License, version 3" provided with ABSOLUTELY NO WARRANTY under the terms of "GNU General Public License, Version 3", available here: http://www.gnu.org/licenses/gpl.html. This product contains some software licensed under the "GNU Affero General Public License, version 3" provided with ABSOLUTELY NO WARRANTY under the terms of "GNU Affero General Public License, version 3", available here: http://www.gnu.org/licenses/agpl-3.0.html. Cisco AP Software, (ap1g4), C1832, RELEASE SOFTWARE Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2015 by Cisco Systems, Inc. Compiled Fri Oct 20 12:02:51 PDT 2017 ROM: Bootstrap program is U-Boot boot loader BOOTLDR: U-Boot boot loader Version 30 AP2C0B.E9C8.0CF0 uptime is 0 days, 0 hours, 21 minutes Last reload time   : Mon Feb 18 08:03:37 UTC 2019 Last reload reason : reload command cisco AIR-AP1832I-F-K9 ARMv7 Processor rev 0 (v7l) with 997268/749320K bytes of memory. Processor board ID KWC2052027Q AP Running Image     : 8.5.105.0 Primary Boot Image   : 8.5.105.0 Backup Boot Image    : 8.5.120.0 2 Gigabit Ethernet interfaces 2 802.11 Radios Radio FW version : aa3dba348b0b87165b91a322796b8fd4 NSS FW version : wstephen,   need someone help   Answer   ... View more